Only 290 days ’til next summer — and the end of Dennis Walcott’s tenure.

More than 1 million students flooded into city schools yesterday for the start of the 2013-2014 academic year — but not all were excited to be back in the classroom.

Yandel Hernandez, 6, cried as his mom led him to Brooklyn School for Global Scholars in Bensonhurst for his first day of first grade.

“He just doesn’t want to go back to school. He loves his summer days,” said mom Candelaria, 27.

Other students were much happier to get back to the chalkboards and laptops.

“Today! It’s today!” yelled 4-year-old Mohamed McMoore, who was overjoyed for his first day of preschool at the Lexington Academy on 104th Street in Manhattan.

“All summer, this one has been asking, ‘Is it today?’ He wants so bad to go to school,” said mom Sherifa McMoore, 35.

And most parents couldn’t wait to unload their kids.

Deputy Schools Chancellor Dennis WalcottDavid McGlynn

“I wish I could drop this one off today!” laughed mom Samantha, 31, pointing to her 7-month-old daughter in her arms as she walked her three older daughters — ages 6, 8, and 9 — into Lexington Academy.

One hiccup in some teachers’ days was a delay in the delivery of lesson plans and materials.

The Department of Education said only 80,000 textbooks still need to be delivered and said 99 percent of schools have received teaching materials.

But United Federation of Teachers officials said the delay was much more widespread.

“The DOE promised to have the curriculum in the teachers’ hands by the start of schools. They have not kept that promise. We have complaints from schools across the city, in every borough, that teachers still don’t have the tools they need,” said UFT chief Michael Mulgrew.

“A Borough Park school has math- assessment tests but none of the materials to teach what they’ll be tested on,” said Ellen Driesen, a UFT district rep in South Brooklyn.

Meanwhile, Walcott welcomed students back to school at Luperon HS for Science and Math in Manhattan, where he told The Post this would be his last year as chancellor.

“It’s never been a secret that the [mayoral] candidates have been saying they want to bring in their own chancellor,” Walcott said.

“My goal is to make sure we keep pushing for a system that benefits all students.”

A total of 1.1 million students walked into 1,819 schools — an increase of 76 schools and a record high for the district.

There are also 4,000 new after-school program slots and 4,000 new full-day preschool slots.

Mayor Bloomberg, also at Luperon, told students, “My first D in high school was in French, and my parents were not thrilled.”